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Share-Based Compensation - Summary of Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]          
Share-based compensation $ 10.7 $ 8.4 $ 30.7 $ 25.5  
Tax benefit 4.1 $ 3.2 11.8 $ 9.8  
Compensation expense related to share-based compensation $ 83.9   $ 83.9   $ 70.6
Weighted average period over which compensation expense will be recognized     3 years